Heterojunctions of silver-iron oxide on graphene for laser-coupled oxygen reduction reactions.

We report a two-step hybridization of N-doped graphene and Ag-decorated Fe2O3 hematite to realize a balanced oxygen adsorption/desorption equilibrium and a laser-coupled ORR (LORR). The stable plateau currents with n values of 3.9 in a wide potential range (0.

General Solvent-dependent Strategy toward Enhanced Oxygen Reduction Reaction in Graphene/Metal Oxide Nanohybrids: Effects of Nitrogen-containing Solvent.

A general solvent-dependent protocol directly influencing the oxygen reduction reaction (ORR) in metal oxide/graphene nanohybrids has been demonstrated. We conducted the two-step synthesis of cobalt oxide/N-doped graphene nanohybrids (CNG) with solvents of water, ethanol, and dimethylformamide (DMF), representing tree typical categories of aqueous, polar organic, and organic N-containing solvents commonly adopted for graphene nanocomposites preparation. The superior ORR performance of the DMF-hybrids can be attributed to the high nitrogen-doping, aggregation-free hybridization, and unique graphene porous structures.

A new antifungal and cytotoxic C-methylated flavone glycoside from Picea neoveitchii.

A new C-methylated flavone glycoside, 5,7-dihydroxy-3-methoxy-6-C-methylflavone 8,4'-di-O-β-D-glucopyranoside (1), was isolated from the twigs and leaves of Picea neoveitchii Mast, together with eight known compounds, 5,7,8,4'-tetrahydroxy-3-methoxy-6-methylflavone 8-O-β-D-glucopyranoside (2) kaempferol 3,4'-di-O-β-D-glucopyranoside (3), apigenin 7-O-β-D-glucopyranoside (4), tiliroside (5), massonianoside B (6), umbeliferone 7-O-β-D-glucopyranoside (7), dihydroconiferin (8) and gleditschiaside A (9). Their structures were elucidated on the basis of analyses of spectroscopic data. Compound 1 showed moderate antifungal activity against tested plant pathogens (Pyricularia grisea (Cooke) Sacc.

Anthriscifolcine A, a C18-diterpenoid alkaloid.

The title compound, C(26)H(39)NO(7), which was isolated from Delphinium anthriscifolium var. majus, has a lycoctonine carbon skeleton containing four six-membered rings (A, B, D and E) and three five-membered rings (C, F and G). Rings A, B and E adopt chair conformation, while ring D adopts a boat conformation.

[Surgery for primary adenoid cystic carcinoma of cervical trachea].

Background & Objective: There were few reports about surgery for primary adenoid cystic carcinoma of cervical trachea. This study was designed to evaluate the efficacy of surgical resection of a series of 13 patients with primary adenoid cystic carcinoma of cervical trachea.

Methods: Thirteen patients who underwent surgical resection with biopsy-proven primary adenoid cystic carcinoma of cervical trachea were reviewed retrospectively.